Get premium membership and access questions with answers, video lessons as well as revision papers.
mechanical advantage(M.A)= load/effort
efficiency= (MA X 100)/velocity ratio(VR)
where; load= 60n
effort= 40n
mechanical advantage= 60/40
= 1.5
efficiency= 60%= (1.5 x 100)/ VR
= 60%= 150/VR
.'. VR= 150/60
= 2.5
Eng melau answered the question on January 25, 2018 at 10:46
- A bubble of soap blown to the wider end of a funnel,When the top is left open the bubbles flatten to a film which rises...(Solved)
A bubble of soap blown to the wider end of a funnel,When the top is left open the bubbles flatten to a film which rises up the funnel. Explain observation.
Date posted: January 23, 2018. Answers (1)
- Two table tennis balls hang at the same level suspended from a thread a short distance apart. A stream of air is blown between the...(Solved)
Two table tennis balls hang at the same level suspended from a thread a short distance apart. A stream of air is blown between the balls. Explain what happens to the balls.
Date posted: January 23, 2018. Answers (1)
- A beaker containing water was placed on a flat bench.State and explain the changes in stability of the beaker when the water freezes to ice.(Solved)
A beaker containing water was placed on a flat bench.State and explain the changes in stability of the beaker when the water freezes to ice.
Date posted: January 23, 2018. Answers (1)
- Why is a metal cap of a leaf electroscope circular?(Solved)
Why is a metal cap of a leaf electroscope circular?
Date posted: January 21, 2018. Answers (1)
- State what happens to the molecules of a gas in a sealed container when temperature of the gas is increased(Solved)
State what happens to the molecules of a gas in a sealed container when temperature of the gas is increased.
Date posted: January 20, 2018. Answers (1)
- Give five examples of suspended particulate matter.(Solved)
Give five examples of suspended particulate matter.
Date posted: January 20, 2018. Answers (1)
- List the two categories of suspended particulate matter that causes pollution.(Solved)
List the two categories of suspended particulate matter that causes pollution.
Date posted: January 20, 2018. Answers (1)
- Describe ozone depletion and its effects.(Solved)
Describe ozone depletion and its effects.
Date posted: January 20, 2018. Answers (1)
- Describe global warming and greenhouse effect in details and state their effects to environment.(Solved)
Describe global warming and greenhouse effect in details and state their effects to environment.
Date posted: January 20, 2018. Answers (1)
- While heating water in a beaker, a wire gauze is placed below the beaker. Explain.(Solved)
While heating water in a beaker, a wire gauze is placed below the beaker. Explain.
Date posted: January 16, 2018. Answers (1)
-
Define principal focus of a concave mirror(Solved)
Define principal focus of a concave mirror
Date posted: January 10, 2018. Answers (1)
- How does the distance between the interference fringes and the separation distance of the slits relate?(Solved)
How does the distance between the interference fringes and the separation distance of the slits relate?
Date posted: January 8, 2018. Answers (1)
- Can visible light produce interference fringes? Explain(Solved)
Can visible light produce interference fringes? Explain
Date posted: January 8, 2018. Answers (1)
- Briefly explain how unpolarized light and plane polarized lights can be distinguished(Solved)
Briefly explain how unpolarized light and plane polarized lights can be distinguished.
Date posted: January 8, 2018. Answers (1)
- A student makes a loud sound and hears the echo of the sound after 2.0s. If the speed of sound in air is 330.5m/s, calculate...(Solved)
A student makes a loud sound and hears the echo of the sound after 2.0s. If the speed of sound in air is 330.5m/s, calculate the distance between the student and the object causing the echo.
Date posted: January 7, 2018. Answers (1)
- What do you understand by the term e.m.f of a cell?(Solved)
What do you understand by the term e.m.f of a cell?
Date posted: January 7, 2018. Answers (1)
- Is it safe to stay in a car during a lightning storm? Explain. (Solved)
Is it safe to stay in a car during a lightning storm? Explain.
Date posted: January 7, 2018. Answers (1)
- (i) State Snell’s law of refraction of light (ii) Give two advantages of totally internally reflecting prisms over plane...(Solved)
(i) State Snell’s law of refraction of light
(ii) Give two advantages of totally internally reflecting prisms over plane mirrors.
Date posted: January 7, 2018. Answers (1)
- A form 4 student observed that his grandfather positions a book far from his eyes when reading it. Explain the type of lenses that the...(Solved)
A form 4 student observed that his grandfather positions a book far from his eyes when reading it. Explain the type of lenses that the student should advice his grandfather to wear.
Date posted: January 7, 2018. Answers (1)
- When a new dry cell is connected in series with a 2.7 ohms resistor, a current of 0.5A flows in the circuit. Determine the internal resistance...(Solved)
When a new dry cell is connected in series with a 2.7 ohms resistor, a current of 0.5A flows in the circuit. Determine the internal resistance of the cell.
Date posted: January 7, 2018. Answers (1)